Normal head space tolerance is about thou, total range. Go slow here. A Wilson type case gage a "go-no go" type gage, or "stop and go" has a chamber precisely cut into a solid cylinder of steel. The cylinder shows both ends of the case and has a small step cut Drifting (CDr) each end. The mouth end is a case length gage, we trim if the case is higher than the step.
The other end is a headspace gage and the head should be between the two levels to make the case meet SAMMI specs. SAMMI specs don't mean at thing to a competent hand loader working with his own rifle. The actual headspace length means nothing if a case properly fits the chamber in which it's fired. By adjusting your sizer as described above, your cases WILL fit your chamber, period. Joined Jan 6, Messages Boomtubes instructions are good. I'll add a couple of other tips Knock out the primer before taking your measurements The second tip being that you will usually have to fire your virgin brass 2 times before they fully expand to the length of your chamber.
Often one firing will leave them. MagMan Well-Known Member. Gene Well-Known Member. First, are you using a magnum case or standard bottle neck case? Headspace is different on magnum, they measure on the belt. Bottle necks measure from base to datum line about half way up the shoulder. When you turn down the bolt, is there stiff resistance? If so, you probably need to bump. Try to bump a minimal amount, not more than. Deprime the case, put the empty in the chamber. First remove firing pin if you can.
That tells you the case shoulder is touching the chamber shoulder and is just Headspace Pilot - Bonechurch - Burning. Going further creates dangerous excess Headspace Pilot - Bonechurch - Burning, and other problems as well.
Dies have 14 threads per inch. A quarter turn changes it a tad under. But it's closer! I move my size die in even more tiny increments once I'm within maybe thou from where I want to be. There are no tools to do that because few care. All we really need to know is how to resize our cases to fit our rifle.
Last edited: Nov 2, Going further creates dangerous excess headspace, and other problems as well" Not sure I understand this idea either Maybe some others like resistance to chambering but Boomtube, you are correct; I did not give much thought to that statement. And I don't turn em down a quarter turn myself. I turn the die down just a fraction, try and if not enough do it again. There is a need for someone to design a shoulder bump measurement tool. But, I have trouble getting consistent readings with it.
The idea Drifting (CDr) you put a small thimble over the case mouth so that it touches the datum line center of shoulderthen use your calipers to measure base to the top of thimble before and after bumping.
But this is real tricky. I have used a 45 ACP deprimed case to do this, but it is not much better. All the answers were right on and very helpful to a reloader, even a novice one, but IMO y'all are performing an exercise in futility.
Joined May 8, Messages Location Ohio. There is nothing futile about headspace measurements. Maybe for someone who knows what they're doing Drifting (CDr) they're rifle then it is an 'understood' issue. To this person, it is futile, but never forget, if you inadvertantly over bump or over size the case body, and forget to check, then uh-oh. You must log in or register to reply here. Trending threads. Did 6. What am I seeing in my barrel? Chris Reed serves as weekend editor and reporter for St.
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